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Consolidated Statements of Operations - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Income Statement [Abstract]    
Revenues $ 1,206 $ 1,682
Cost of revenues 2,279 1,787
Gross loss (1,073) (105)
Operating expenses:    
Engineering and product development costs 4,747 4,344
Selling, general and administrative costs 7,772 6,916
Total operating expenses 12,519 11,260
Operating loss (13,592) (11,365)
Gain due to the change in fair value of warrant liabilities 6
Litigation settlement (1,224)
Interest income, net 124 124
Other expense, net (83)
Foreign exchange gain/(loss) 15 (12)
Loss before income taxes (14,760) (11,247)
Income tax benefit 895
Net loss $ (14,760) $ (10,352)
Basic and diluted net loss per share $ (0.49) $ (1.44)
Weighted average shares used to compute basic and diluted net loss per share 30,018,838 7,209,732